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Captures the same gritty, post-war British atmosphere and dives deep into the psychology of its morally ambiguous characters, much like Procter's realistic portrayal of the criminal underworld and the human cost of crime. It explores themes of crime, innocence, and redemption within a bleak urban landscape.

As a foundational police procedural, Simenon's Maigret series offers a similar methodical, psychologically astute approach to crime investigation, focusing on the human element within a distinctly atmospheric setting, which fans of Procter's realism will appreciate. It delves into the detective's observational skills and understanding of human nature.

For readers who enjoy the hardboiled edge and cynical wit in Procter's work, Chandler's iconic Philip Marlowe series provides a masterclass in the genre, featuring a world-weary detective navigating a morally complex and dangerous urban landscape. It's a classic of detective fiction with intricate plots and memorable characters.

Another cornerstone of hardboiled detective fiction, Hammett's work offers a stark, unsentimental look at crime and human greed, with a tough, pragmatic protagonist that echoes the grounded realism found in Procter's police procedurals. It's a compelling story of betrayal and the pursuit of a valuable, elusive object.

This novel provides an even darker and more brutal exploration of the British criminal underworld, sharing Procter's unflinching realism and a bleak, unforgiving atmosphere as a man returns to his roots for a violent quest for revenge. It's a quintessential piece of British noir, raw and impactful.

Marking the debut of Adam Dalgliesh, this book offers a more cerebral and atmospheric British police procedural, blending meticulous investigation with psychological insight and a keen observation of social dynamics, appealing to fans of Procter's grounded realism. It's a classic whodunit with depth.

The first in the Dalziel and Pascoe series, this book introduces a compelling duo in a classic British police procedural setting, combining intricate plotting with sharp characterization and a keen eye for the social fabric, much like Procter's work. It offers a blend of wit and serious crime investigation.

Introducing the iconic Inspector Rebus, this novel delves into the grittier side of Scottish crime, offering a dark, atmospheric, and psychologically complex police procedural that will resonate with readers who appreciate Procter's realistic portrayal of law enforcement and urban decay. It's a compelling start to a beloved series.

While set in America, Wambaugh's novel offers an exceptionally realistic and often bleak portrayal of the daily lives and psychological toll on police officers, providing a deep dive into the procedural aspects and human element of law enforcement that Procter's fans will find compelling. It's an intimate look at the realities of the job.

This classic noir novel explores the dark impulses of ordinary people driven to crime, offering a tense, psychological, and morally ambiguous narrative that, while not a police procedural, shares the raw, gritty realism and fatalistic tone found in Procter's work. It's a powerful story of passion and desperation.